Within marriage, maternal filiation is established by the act of giving birth, while paternal filiation is based on presumption (“the husband of the mother is the father of a child conceived or born during marriage”).
En el seno del matrimonio, la filiación materna se deduce del hecho del parto mientras que la filiación paterna se basa en una presunción ("el niño concebido o nacido durante el matrimonio tiene por padre al marido de la madre").